Handsome sunny boys should wear black or yellow underwear! ! Common sense: A pair of dirty underwear contains 0. 1 gram of feces on average, and one gram of feces contains100000 viruses. Microbiologists all over the world have studied washing machines. A pair of dirty underwear contains an average of 0. 1 g feces, which contains salmonella, Escherichia coli and other germs. One gram of feces contains 100000 viruses,10. Although some bacteria and viruses are beneficial to people, most bacteria and viruses are harmful to people. Even if it is properly cleaned and aired, the bacteria on it can't be completely killed. Under normal circumstances, underwear with high frequency of use should be changed once every six months. If the underwear is deformed, the material becomes dry and hard, and the stain cannot be washed clean, it must be replaced in time. Change underwear: no more than 2-3 days. It is recommended to change underwear every day, especially in summer. No more than 2-3 days. Separate from the coat when cleaning, and wash it by hand with soap as much as possible. Don't directly expose yourself to the sun after washing. Let it dry in the shade first, and then disinfect it in the sun. Otherwise, underwear will be hard and easily deformed. In addition, it is best to separate underwear. You can buy some special storage bags or put them in clean plastic bags to avoid dust and bacteria and affect your health.